Eye Structure and Function

It is the transparent, curved front of the eye which helps to converge the light rays which enter the eye

• Retina

• Cornea

• Sclera

• Pupil

Is a hole in the middle of the iris where light is allowed to continue its passage. In bright light it is constricted and in dim light it is dilated

• Cornea

• Iris

• Pupil

• Fovea

Is a pigmented muscular structure consisting of an inner ring of circular muscle and an outer layer of radial muscle. Its function is to help control the amount of light entering the eye so that:

- too much light does not enter the eye which would damage the retina

- enough light enters to allow a person to see

• Iris

• Pupil

• Lens

• Retina

Is a transparent, flexible, curved structure. Its function is to focus incoming light rays onto the retina using its refractive properties

• Lens

• Cornea

• Fovea

• Ciliary body

Is a layer of sensory neurones, the key structures being photoreceptors (rod and cone cells) which respond to light. Contains relay neurones and sensory neurones that pass impulses along the optic nerve to the part of the brain that controls vision

• Fovea

• Choroid

• Retina

• Fovea

Type of photoreceptor that is active in bright light and perceives color?

• fovea centralis
• cones
• rods
• optic disk

Type of photoreceptor that functions in low light and creates shades of gray

• retina
• rod
• cone
• choroid

A light - sensitive layer of tissues at the back of the eye that turns light into electrical signals

• Retina

• Optic Nerve

• Lens

• Photoreceptors

What is the correct order of photoreception?

• retinal ganglion, bipolar cells, cones or rods, optic nerve

• cones or rods, bipolar cells, retinal ganglion, optic nerve

• bipolar cells, cones or rods, retinal ganglion, optic nerve

• bipolar cells, retinal ganglion, cones or rods, optic nerve

What is the structure labelled 1?